architecture (Scrapper Hangar Roof)
builded a temporary scrapper hangar roof (4x4, please test the 8x8 as well) and dismantled it again. after removing all materials i was not able to remove the ghost.
maybe it helps you to find the error. i used "old" large metal sheets without any stats or name on it like iron/steel and such. when you dismantle buildings they will get randomly (imo) stats/names. used a lot of old stuff like twines and so on for other architectures without stats/names, and it worked well when i dismatled them.